AFE2256

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community AFE2256 SBAS693B – MARCH 2015 – REVISED MAY 2016 AFE2256 256-Channel, Analog Front-End for Digital X-Ray, Flat-Panel Detectors 1 Features 1 256 Channels On-Chip, 16-Bit ADC Photodiode Short Immunity High Performance: – Noise: 750 Electrons RMS (1.2-pC Input Charge Range) – Low Correlated Noise – Integral Nonlinearity: ±2 LSB with Internal 16-Bit ADC – Scan Time: – < 20 µs to 204.8 µs Integration: – Six Selectable, Full-Scale Input Ranges: 0.6 pC (Min) to 9.6 pC (Max) – Internal Timing Generator (TG) – Built-In Correlated Double Sampler – Pipelined Integrate and Read for Improved Throughput: Allows Data Read During Integration – Serial LVDS Output Simple Power-Supply Scheme: – AVDD1 = 1.85 V – AVDD2 = 3.3 V Low Power Consumption Nap and Total Power-Down Mode Custom Chip-On-Film (COF) Packages 2 Applications Flat-Panel, X-Ray Detectors Charge Detectors Capacitance Measurement 3 Description The AFE2256 is a 256-channel, analog front-end (AFE) designed to suit the requirements of flat-panel detector (FPD)-based digital x-ray systems. The device includes 256 integrators , a programmable gain amplifier (PGA) for full-scale charge level selection, a correlated double sampler (CDS) with dual banking, and 256:4 analog multiplexers. The device also features four 16-bit successiveapproximation register (SAR) analog-to-digital converters (ADCs). Serial data from the ADCs ar...